Mechanism for feeding and severing cardboard and like sheets



CARDBOARD AND LIKE SHEETS W. E. MOLINS MECHANISM FOR FEEDING AND SEVERING Filed Nov. 14, i928 Patented Aug. 4, 1931 UNITED STATES WALTER EVERETT MOLINS, OF LONDON, ENGLAND MECHANISM FOR FEEDING AND sEvE Iive oAEnBoA nAnn LIKE sHEE'rs Application filed November 14, 1928, Serial No. 319,270, and in Great Britain December 5, 1927.

This invention is for improvements in or relating to blank forming mechanism, and more particularly to a device adapted to out a blank of a particular design from a printed or embossed sheet of material so that the cut design is in correct register with the printing or embossing applied to the sheet.

The present invention consists of a blank forming mechanism wherein means, for exlo ample a suction device is arranged to feed a printed or embossed sheet from a pile to means arranged to receive the sheet and feed the same in correct register to cutting mechanism formed upon two rollers operable to cut a design from each sheet of material in correct register with the design printed or embossed thereon.

The invention is more particularly described with reference to the accompanying 2o drawings, in which Fig. 1 is a sectional elevation of the machine.

Fig. 2 is a plan of one end of the machine showing the cutting rollers.

Fig. 3 is a detail of the magazine in the direction of the arrow A.

Fig. 4518 a diagram of a blank.

Referring to Fig. l; the machine comprises a stacker 1 arranged to accommodate so a series of sheets of printed or embossed material 2, for example, cardboard.

Arranged to co-operate with the lowermost sheet of cardboard is a suction device 3 which engages with the forward end of each sheet at substantially the midwidth of the same so as to draw the forward end of the sheet downwardly.

The sheets are supported at each side of their forward end upon narrow flanges 4 (Fig. 3) so that as the suction member 3 engages with the lowermost sheet it bows the same, due to the side edges of the sheet being retained by the said flanges. As the sheet is being so bowed, a wedge shaped member 5 is arranged to move forwardly into the space formed by the bowed portionof the lowermost sheet to thereafter press the said sheet downwardly towards a continuously rotating roller 6 which, in co-operation with the roller 50 7 mounted on the said wedge shaped member,

feeds the sheet forwardlyto a pair of feeding rollers 8 and 9 which are arranged to feed the sheet of material in a forward direction along guides 10* until the leading end of the sheet is in close proximity to the contacting surfaces of the two'cutting rollers 10 and 11.

The'method of operating the oscillating suckerB comprises a cam 12 which engages with a cam lever13 on the spindle of which 1'60 is mounted the carrier 14 of the suction device. A'link 15 connects the other end of the cam lever 13to a bell crank lever 16 which carries the roller '7 and the wedge shaped'device 5. A small roller 17 is mounted at the 765 forward'end ofthe magazine table and the blanks ride over this as they are withdrawn by the suction device.

When the leadingedgeof the sheet is near to thecutting rollers 10 and 11 as above de scribed, a pair of oscillating arms 18 are arranged to engage with the rearward edge of the said sheet and move the same forwardly in'such a manner that the shcetis fed-squarely and in correct register with the cutting knives 5. formed on the cutting rollers. The cutting rollers thereupon engage with the sheet and sever the hatched portions, Fig. 4, therefrom so as to produce the desired cut-out pattern upon the blank in correct register with the printed or embossed matter applied to the sheet. The waste material is stripped from the blank by a series of pins 19, Fig. 2, formed on the lower roller in the usual manner.

The method of operating the oscillating arms 18 is clearly shown at Fig. 1. The arms are carried by pivoted links 20 operated by cam levers 21 from the cam 22. As the arms 18 move to the right in Fig. 1 they hang downwardly to a certain extent to avoid interference with the sheet, but as they move to the left in the same figure, a cam 23 raises a bell crank lever 24 and a roller 25 on said lever lifts the arms 18 so that they engage with the end of the sheet. A small brush 26 exercises suflicient friction upon the surface of the sheet to avoid any displacement. As the sheet passes between the cutting rollers the portions 1) and 0 are positively removed therefrom by a stripper 27 of the type de-" scribed in specification No. 10,335 of 1928 and the blank passes across a plate 28 to the receiver 29 while the stripped portions fall downwards into a waste boX (not shown).

Thus it will be seen that according to the present invention a large sheet of cardboard may be printed upon by a lithographic process and thereafter severed into rectangular sheets from which blanks of a desired formation, adapted to be formed into packets, may be thereafter severed in such a manner that the cut away portions of the blank are in correct register with the printing upon the same.

WVhat I claim as my invention and desire to secure by Leters Patents is 2-- In a blank feeding device, the combination with means for supporting the side edges only of a stack of blanks, of means for engaging the face of the lowermost blank of a stack of blanks to bow the central portion of the same outwardly, means having a portion thereof movable between the said blank and the stack to convey the blank away from the stack, said last named means comprising a conveyor roller and a device consisting of a reciprocable wedge shaped member and a roller mounted on said member for thrusting the blank into engagement with said conveyor roller, and means including a pair of reciprocating spaced elements adapted to receive each blank from said conveyor roller and deliver the same to apparatus for performing an operation on the blank, said spaced elements engaging the rear edge of the blank on opposite sides thereof.

In testimony whereof I hereunto aflix my signature.

WALTER EVERETT MOLINS. 

